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| >>> profondeur(monarbre,0)
+ ('A', 0)
(('B', 0.15), (('C', 0.22), None, None), (('D', 0.12), None, None))
(('E', 0.2), (('F', 0.18), None, None), (('G', 0.22), None, None))
+ ('B', 0.15)
| (('C', 0.22), None, None)
|--+ (('D', 0.12), None, None)
+ ('C', 0.22)
| | None
|--+ |--+ None
+ ('D', 0.12)
| | None
|--+ |--+ None
+ ('E', 0.2)
| (('F', 0.18), None, None)
|--+ (('G', 0.22), None, None)
+ ('F', 0.18)
| | None
|--+ |--+ None
+ ('G', 0.22)
| | None
|--+ |--+ None |